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Lanthanoids are [2004]
- a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevel
- b)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel
- c)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sublevel
- d)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = ...
Lanthanides are 4 f-series elements starting from cerium (Z= 58) to lutetium ( Z = 71).
These are placed in the sixth period and in third group.
These are placed in the sixth period and in third group.
Most Upvoted Answer
Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = ...
The correct answer is option C: 14 elements in the sixth period (atomic no. = 58 to 71) that are filling the 4f sublevel.
Explanation:
- The periodic table is organized into periods and groups. The periods are horizontal rows, and the groups are vertical columns.
- The lanthanoids, also known as the lanthanides, are a group of elements that belong to the f-block of the periodic table.
- The lanthanoid series consists of 14 elements that fill the 4f sublevel. These elements have atomic numbers ranging from 58 to 71.
- The 4f sublevel is part of the fourth energy level (n=4) and is characterized by its unique electron configuration.
- In the lanthanoid series, the 4f sublevel is gradually filled up as you move across the period. Each element in the series adds one more electron to the 4f sublevel until it is completely filled.
- The lanthanoids are located in the sixth period of the periodic table because they correspond to the filling of the 4f sublevel.
- The lanthanoids are known for their similar chemical properties, which arise from the filling of the 4f sublevel. They are generally soft, malleable metals with high melting points and good electrical conductivity.
- Some common examples of lanthanoids include cerium (Ce), praseodymium (Pr), and europium (Eu).
- It's important to note that the atomic numbers of the lanthanoids range from 58 to 71, not from 90 to 103 as mentioned in options A and B. The atomic numbers from 90 to 103 correspond to a different series of elements called the actinoids, which fill the 5f sublevel.
- Therefore, the correct answer is option C: 14 elements in the sixth period (atomic no. = 58 to 71) that are filling the 4f sublevel.
Explanation:
- The periodic table is organized into periods and groups. The periods are horizontal rows, and the groups are vertical columns.
- The lanthanoids, also known as the lanthanides, are a group of elements that belong to the f-block of the periodic table.
- The lanthanoid series consists of 14 elements that fill the 4f sublevel. These elements have atomic numbers ranging from 58 to 71.
- The 4f sublevel is part of the fourth energy level (n=4) and is characterized by its unique electron configuration.
- In the lanthanoid series, the 4f sublevel is gradually filled up as you move across the period. Each element in the series adds one more electron to the 4f sublevel until it is completely filled.
- The lanthanoids are located in the sixth period of the periodic table because they correspond to the filling of the 4f sublevel.
- The lanthanoids are known for their similar chemical properties, which arise from the filling of the 4f sublevel. They are generally soft, malleable metals with high melting points and good electrical conductivity.
- Some common examples of lanthanoids include cerium (Ce), praseodymium (Pr), and europium (Eu).
- It's important to note that the atomic numbers of the lanthanoids range from 58 to 71, not from 90 to 103 as mentioned in options A and B. The atomic numbers from 90 to 103 correspond to a different series of elements called the actinoids, which fill the 5f sublevel.
- Therefore, the correct answer is option C: 14 elements in the sixth period (atomic no. = 58 to 71) that are filling the 4f sublevel.
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Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer?.
Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Lanthanoids are [2004]a)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevelb)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevelc)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subleveld)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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